Official PYQ · 2002Set 1 · Q2.21LTI SystemsMCQ1 mark

GATE EC 2002 Set 1 Q2.21 — LTI Systems

If the variance $\sigma_{x}^{2}$ of $d(n)=x(n)-x(n-1)$ is one-tenth the variance $\sigma_{x}^{2}$ of a stationary zero-mean discrete-time signal $x(n)$ , then the normalized autocorrelation function $R_{x x}(k) / \sigma_{x}^{2}$ at $k=1$ is

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Published 10 Oct 2026

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